Added defaultt values

app/src/main/res/values/default_config.xml

@@ -1,11 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <string name="address">http://localhost:8337</string>
+    <integer name="threads">2</integer>
+
     <integer name="size">10</integer>
     <bool name="random">true</bool>
     <bool name="use_albums">true</bool>
     <string name="query"/>
     <bool name="start_charging">false</bool>
     <integer name="download_interval">7</integer>
-
-
 </resources>

app/src/main/res/xml/preferences.xml

@@ -2,14 +2,14 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
 
     <EditTextPreference
-        android:defaultValue="http://localhost:5785"
+        android:defaultValue="@string/address"
         android:inputType="text"
         android:key="address"
         android:summary="Address of the synchronisation server"
         android:title="Address" />
 
     <EditTextPreference
-        android:defaultValue="2"
+        android:defaultValue="@integer/threads"
         android:inputType="number"
         android:key="threads"
         android:summary="Number of threads to use for downloading"